1993 Buick Skylark C0 % level to high

1993 BUICK SKYLARK
125,211 MILES • 6 CYL • 2WD • AUTOMATIC
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CHEF35
  • MEMBER
  • 1 POST
To car through inspection and it failed because C0 % was at 2.47 when it should be at 1.20. when car is in park or reverse it sounds fine however when in drive it sounds as though there is a hole in the manifold or muffler, I took it in for service and no holes where found. what can cause the CO % to be high, also what could make it sound so loud when in drive only?
Oct 20, 2009 at 4:09 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,992 POSTS
Too rich of a mixture causing the CO to be high could be caused by the coolant temperature sensor, oxygen sensor, dirty air filter and engine oil contaminated with fuel
Oct 20, 2009 at 4:46 AM
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